CN100595601C - Pump storage plant generator/ motor stator transient time constant test method - Google Patents
Pump storage plant generator/ motor stator transient time constant test method Download PDFInfo
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- CN100595601C CN100595601C CN200810015879A CN200810015879A CN100595601C CN 100595601 C CN100595601 C CN 100595601C CN 200810015879 A CN200810015879 A CN 200810015879A CN 200810015879 A CN200810015879 A CN 200810015879A CN 100595601 C CN100595601 C CN 100595601C
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Abstract
The invention discloses a pumped storage station generating electricity/motor stator transient time constant testing method, with advantages: saving the test cost, reducing the tested machine risk andreducing the work load. The method comprises the following steps: 1) directly capturing and controlling the controlling quantity of the excitation silicon controlled rectifier to generate a stepped amount of the generator rotor voltage; 2) calculating the open circuit, short circuit transient time constant using interpolation algorithm during the stable time after rotor voltage stepping, whereinthe open circuit, short circuit transient time constant is 2e<SUP>-t1/T</SUP>-e<SUP>-t2/T</SUP>=1.
Description
Technical field
The present invention relates to large-scale generator/motor technical feature ginseng testing experiment method, relate in particular to a kind of pump storage plant generator/motor stator transient time constant method of testing.
Background technology
Along with development of electric power industry, net capacity and coverage enlarge rapidly, and problems such as peak load regulation network, accident emergency use and black startup are more and more outstanding.The economic development of China and the Regional Distribution of hydroelectric resources are very uneven, bring bigger peak regulation difficulty for the eastern region electrical network of hydroelectric resources rareness.Pumped Storage Power Station Construction is the economy that addresses the above problem, way efficiently.In addition, the construction of nuclear power generating sets has also required hydroenergy storage station to cooperate.The existing a lot of hydroenergy storage stations of China were gone into operation successively in recent years; Account for the ratio of electrical network total volume with reference to external hydroenergy storage station, from now on Pumped Storage Power Station Construction energetically also in period.
The water-storage unit will be in conjunction with natural conditions such as the geography of upper and lower reservoir, conduit pipe and underground power house, geology in when design, and the factor of aspects such as the concrete condition of consideration place electrical network and whole engineering economics, therefore, the design of main equipment, manufacturing are to carry out ground by the pattern of " cutting the garment according to the figure " basically; Simultaneously, these giant mechanical and electrical equipments generally all are to use (installation) field-installed, and this just requires trial run stage after hydroenergy storage station is built up to carry out the on-the-spot test test and the equipment performance testing experiment of equipment and technology parameter.
Utilize the method for rotor loop sudden short circuit test to measure motor open circuit, short circuit transient time-constant in GB and relevant international standard and the production practices in the past.This method requires to insert jumbo short circuiting switch temporarily and insert current-limiting resistance in the outside of short circuiting switch temporarily and protect exciting controllable silicon rectifier cabinet and exciting transformer in rotor loop.This not only needs high-capacity switching equipment, greatly increases testing expenses, and carries out a large amount of demolition, installation and retrofit work in the rotor loop, and workload is very big, and the process of the test of short dozens of minutes need spend 1-2 days time to prepare and resume work.Test itself brings extra, potential danger for the high capacity silicon controlled rectifier cabinet and the exciting transformer of generator excited system, carries out demolition, installation in the rotor loop and retrofit work also causes potential danger to rotor loop.
Summary of the invention
Purpose of the present invention is exactly that providing a kind of does not need any large capacity equipment not need tested unit unit is carried out any transformation yet in order to address the above problem; Save experimentation cost, time and can not bring the pump storage plant generator/motor stator transient time constant method of testing of extra, potential advantages such as danger.
For achieving the above object, the present invention adopts following technical scheme:
1) directly intercepts and captures and control exciting controllable silicon rectifier controlled quentity controlled variable, make generator amature voltage produce a step amount;
2) the stationary time section after the rotor voltage step produces adopts interpolation algorithm to calculate open circuit, short circuit transient time-constant, and wherein, stator open circuit, short circuit transient time-constant T are: 2e
-t1/T-e
-t2/T=1.
Described step 2) detailed process is, the moment that begins to decay with stator voltage or stator short-circuit current in the rotor voltage stationary time section on stator voltage or stator short-circuit current attenuation process record ripple figure is a starting point, select two time period t 1, t2, the principle of selection is that the attenuation amplitude in the t2 time period is 2 times of interior attenuation amplitude of t1 time period;
Measure the actual value of t1, t2 from record ripple figure, utilize the multiple relation of the attenuation amplitude in t2, t1 time period and interpolation algorithm constant computing time that progressively approaches, thereby obtain having stator open circuit transient time-constant, the stator short circuit transient time-constant of enough accuracy.
The present invention is the open a way definition of transient time-constant, stator short circuit transient time-constant of theoretical and stator according to the operation of synchronous motor, under the situation that unit rotates under rated speed and stator winding is opened a way, when in rotor loop, applying the rotor voltage step excitation, the response of stator voltage be by with time be independent variable exponential function rule from a steady-state value slowly, vary continuously to another steady-state value.This is that the time constant of the exponential function of independent variable is exactly the stator open circuit transient time-constant of motor with time.In like manner, under the situation of stator winding short circuit, when in rotor loop, applying the rotor voltage step excitation, the response of stator current be by with time be independent variable exponential function rule from a steady-state value slowly, vary continuously to another steady-state value.This is that the time constant of the exponential function of independent variable is exactly the stator short circuit road transient time-constant of motor with time.Consider the non-linear factor that the motor magnetic circuit is saturated, generally apply the unloaded rated voltage of rotor, enroll under this excitation response process constant computing time of stator voltage to zero step excitation.
In order to obtain the rotor voltage step excitation, in traditional test method, adopt the method for external high capacity short circuiting switch give rotor loop apply suddenly a short dot obtain rotor voltage from a stationary value suddenly to the zeroth order excitation that jumps, this method background one that possesses skills is narrated various shortcoming in saving.The utility model proposes the method for direct intercepting and capturing and control exciting controllable silicon rectifier controlled quentity controlled variable, make generator amature voltage produce a step amount, the attenuation process of record rotor voltage and stator voltage (or stator short-circuit current) is measured open circuit, short circuit transient time-constant.Intercepting and capturing, control the means of exciting controllable silicon rectifier controlled quentity controlled variable will decide according to the concrete brand and the model of unit excitation system, generally need not increase any hardware device and any hardware and change.This test method only needed tens minutes can finish test preliminary work.Save a large amount of material resources, manpower and time.
Because silicon controlled rectifier changes the influence that arc voltage falls, after the rotor voltage step produced, rotor voltage was stabilized in a certain less negative value, selected the stationary time section after the rotor voltage step produces for this reason, adopted interpolation algorithm to calculate open circuit, short circuit transient time-constant.Concrete grammar is: the moment that begins to decay with stator voltage (or stator short-circuit current) in the rotor voltage stationary time section on stator voltage (or stator short-circuit current) attenuation process record ripple figure is a starting point, select two time period t 1, t2, the principle of selection is that the attenuation amplitude in the t2 time period is 2 times of interior attenuation amplitude of t1 time period.Measure the actual value of t1, t2 from record ripple figure, utilize the multiple relation of the attenuation amplitude in t2, t1 time period and interpolation algorithm constant computing time that progressively approaches.Thereby obtain having stator open circuit transient time-constant, the stator short circuit transient time-constant of enough accuracy.
The invention has the beneficial effects as follows: test method is simple, does not need any large capacity equipment also not need tested unit is carried out any transformation; Save experimentation cost, time and can not bring extra, potential danger.
Description of drawings
Record ripple figure when Fig. 1 opens a way for stator;
Record ripple figure when Fig. 2 is the stator short circuit.
Embodiment
The present invention will be further described below in conjunction with embodiment.
Fig. 1, Fig. 2 are No. 2 unit test findings of Mount Taishan, Tai'an hydroenergy storage station:
The present invention tests the stator open circuit transient time-constant of the generator/motor of water-storage unit, the method for stator short circuit transient time-constant, be not to relate to all technical feature ginseng testing experiments of generator/motor, and just be used for testing stator open circuit transient time-constant, the stator short circuit transient time-constant of generator/motor, its detailed process is:
1) directly intercepts and captures and control exciting controllable silicon rectifier controlled quentity controlled variable, make generator amature voltage produce a step amount;
2) the stationary time section after the rotor voltage step produces adopts interpolation algorithm to calculate open circuit, short circuit transient time-constant, and wherein, stator open circuit, short circuit transient time-constant T are: 2e
-t1/T-e
-t2/T=1.
Described step 2) detailed process is, the moment that begins to decay with stator voltage or stator short-circuit current in the rotor voltage stationary time section on stator voltage or stator short-circuit current attenuation process record ripple figure is a starting point, select two time period t 1, t2, the principle of selection is that the attenuation amplitude in the t2 time period is 2 times of interior attenuation amplitude of t1 time period;
Measure the actual value of t1, t2 from record ripple figure, (adopt Fig. 1 during the stator open circuit, adopt Fig. 2 during the stator short circuit) utilize the multiple relation of the attenuation amplitude in t2, t1 time period and interpolation algorithm constant computing time that progressively approaches, thus obtain having stator open circuit transient time-constant, the stator short circuit transient time-constant of enough accuracy.
Among Fig. 1, t1=2.5s, t2=6s, then stator open circuit transient time-constant 2e
-2.5/T-e
-6/T=1, T=8.85S
Among Fig. 2, t1=0.98s, t2=2.38s, then stator short circuit transient time-constant 2e
-0.98/T-e
-2.38/T=1, T=3.3s.
Claims (2)
1, a kind of pump storage plant generator machine stator open circuit transient time constant test method is characterized in that, its step is,
1) directly intercepts and captures and control exciting controllable silicon rectifier controlled quentity controlled variable, make generator amature voltage produce a step amount;
2) the stationary time section after the rotor voltage step produces, adopt interpolation algorithm to calculate the open circuit transient time-constant, promptly the moment that begins to decay with stator voltage in the rotor voltage stationary time section on stator voltage attenuation process record ripple figure is a starting point, select two time period t 1, t2, the principle of selection is that the attenuation amplitude in the t2 time period is 2 times of interior attenuation amplitude of t1 time period;
Measure the actual value of t1, t2 from record ripple figure, utilize the multiple relation of the attenuation amplitude in t2, t1 time period and interpolation algorithm constant computing time that progressively approaches, thereby the stator open circuit transient time-constant T that obtains having enough accuracy makes: 2e
- T1/T-e
-t2/T=1.
2. a pump storage plant generator machine stator short circuit transient time constant test method is characterized in that, its step is,
1) directly intercepts and captures and control exciting controllable silicon rectifier controlled quentity controlled variable, make generator amature voltage produce a step amount;
2) the stationary time section after the rotor voltage step produces, adopt interpolation algorithm to calculate the short circuit transient time-constant, promptly the moment that begins to decay with the stator short-circuit current in the rotor voltage stationary time section on stator short-circuit current attenuation process record ripple figure is a starting point, select two time period t 1, t2, the principle of selection is that the attenuation amplitude in the t2 time period is 2 times of interior attenuation amplitude of t1 time period;
Measure the actual value of t1, t2 from record ripple figure, utilize the multiple relation of the attenuation amplitude in t2, t1 time period and interpolation algorithm constant computing time that progressively approaches, thereby the stator short circuit transient time-constant T that obtains having enough accuracy makes: 2e
-t1/T-e
-t2/T=1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101719753B (en) * | 2009-12-30 | 2012-05-23 | 国网电力科学研究院 | Method for detecting initial position of rotor of static frequency-conversion starting motor of pumped storage power station |
| CN106501719B (en) * | 2016-11-01 | 2019-02-12 | 广东电网有限责任公司电力科学研究院 | A kind of generator system equivalent time constant test method |
| CN110646730B (en) * | 2018-06-27 | 2022-04-12 | 北京自动化控制设备研究所 | Method for estimating electromechanical time constant of motor |
| CN113809964B (en) * | 2021-08-23 | 2023-08-01 | 长江三峡能事达电气股份有限公司 | Excitation control method for given value amplitude reduction step |
Citations (4)
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|---|---|---|---|---|
| US5594670A (en) * | 1993-09-03 | 1997-01-14 | Kabushiki Kaisha Meidensha | Apparatus for measuring circuit constant of induction motor with vector control system and method therefor |
| CN1866038A (en) * | 2005-07-07 | 2006-11-22 | 高政 | Large-scale grounding network detection technology and detection system for power plant and transformer substation |
| CN1904623A (en) * | 2005-07-25 | 2007-01-31 | 华东电力试验研究院 | Performance test method of synchronous phasor measuring device and test system |
| CN101017191A (en) * | 2007-03-01 | 2007-08-15 | 华北电力大学 | On-line fault diagnoses method on rotor winding inter turn short-circuit of turbine generator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5594670A (en) * | 1993-09-03 | 1997-01-14 | Kabushiki Kaisha Meidensha | Apparatus for measuring circuit constant of induction motor with vector control system and method therefor |
| CN1866038A (en) * | 2005-07-07 | 2006-11-22 | 高政 | Large-scale grounding network detection technology and detection system for power plant and transformer substation |
| CN1904623A (en) * | 2005-07-25 | 2007-01-31 | 华东电力试验研究院 | Performance test method of synchronous phasor measuring device and test system |
| CN101017191A (en) * | 2007-03-01 | 2007-08-15 | 华北电力大学 | On-line fault diagnoses method on rotor winding inter turn short-circuit of turbine generator |
Non-Patent Citations (4)
| Title |
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| 华北电网大容量发电机励磁***建模与参数辨识测试. 刘永奇等.电网技术，第31卷第5期. 2007 |
| 华北电网大容量发电机励磁***建模与参数辨识测试. 刘永奇等.电网技术，第31卷第5期. 2007 * |
| 同步发电机阶跃响应最优控制方法的研究与实验. 彭济湘.中国优秀硕士学位论文全文数据库(电子期刊). 2006 |
| 同步发电机阶跃响应最优控制方法的研究与实验. 彭济湘.中国优秀硕士学位论文全文数据库(电子期刊). 2006 * |
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Effective date of registration: 20220129 Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: STATE GRID CORPORATION OF CHINA |